Phylum: Charophyta   Family: Closteriaceae

Closterium aciculare T. West 1860

First described and illustrated by West 1860: 153, pl. 7: 16). Tuffen West was a nineteenth-century British botanist and illustrator. He was the author of ‘Half-Hours with the microscope, … 1858’.
Cell dimensions: L: 350-650 µm; B: 5-8 µm; Ap: 1.5-2.00 µm; L/B: 45-120.
Found in the plankton of lochs and in moorland pools. A common species with a wide pH tolerance; it can be found in great abundance in some habitats.

References: 
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
West, T. (1860) Remarks on some Diatomaceae new or imperfectly described and a new desmid.
West, W. & West, G.S. (1904) A Monograph of the British Desmidiaceae, Volume 1.